fix: cache-bust manifest.json for v2.1.0

Author: makepkg

website/src/pages/flash.astro

@@ -511,7 +511,7 @@ import Layout from '../layouts/Layout.astro';
   function updateManifest() {
     const flashButton = document.getElementById('flash-button');
     if (flashButton) {
-      flashButton.setAttribute('manifest', '/SecureGen/firmware/manifest.json');
+      flashButton.setAttribute('manifest', '/SecureGen/firmware/manifest.json?v=2.1.0');
     }
   }